Electric motor



(No Model.)

0. P. LOOMIS & H. W. OOOLEY. ELECTRIC MOTOR.

N0. 337,777. Patented Mar. 9, 1886.

Fig. 2.

OSBOEN P.

ELECTRIC a fl OTUi in forming part of Letters Patent No. 837,777, dated March 9,1886.

Application filed September 22, 1885. Serial No. 177,794. (No model.)

To 00% whom ii may concern.-

Be it known that we, Osnonn P. Looms and HENRY W. CooLEv, citizens of the United States, and residents of Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Electric Motors, of which the following is a specification.

The valuable and patentable features of this our presentinvention have reference to certain important improvements in the form, combination, and disposition of the several elements embodied in the construction and necessary to the operation of the class of devices named in the title of this invention, but which,in conjunction with our improvements, may be devoted by the party controlling the patent to any purpose now or hereafter proposed.

Our invention consists of certain elements organized, essentially as described, in conformity to the accoi'npunying drawings, adapted to operate as hereinafter explained, including all modifications as to their form, combination, and disposition applicable to any purpose, mentioned or not mentioned, but especially applicable to the uses alluded to, and differcut, when considered in entirety, from any device ever before made public, as far as the records prove.

By a general but critical examination of the state of the art, as disclosed by periodicals, books, and the more in portant patents, it is evident that there is plenty of room for improvement in the class of devices forming the subjectmatter of this specification. One device is simple but ineffectual; another is too complicated, and therefore too expensive; another is, from the very nature of its construction, unattractive in appearance and inconvenient of operation, while others are practically worthless.

By a diligent and systematic study in the application of the principles of science and of invention, and by trials of successivelyimproved devices, we have succeeded in ct fecting such important improvements that the device is at once adapted to meet the wants of all concerned in a very effectual and superior manner, which is the object of our invention.

In order to illustrate the practical manner of carrying out our invention, drawings are hereunto annexed and described, in which similar letters of reference represent corresponding elements, and in which each part referred to is designated by a single letter.

Those parts not mentioned we do not claim in this our present application.

The materials of construction employed, the exact forms of design, and the proportional dimensions are not alluded to in every instance, as they are best determined upon by those versed in the art.

Figure 1 is a general view of the electric motor, and Fig. 2 shows the direction of wind ing the armature.

The electric motor comprises two upright supports, A, two belts, B, connecting said supports and retained by nuts 0, and semicylindrical pole-pieces D, having projections E, which are each located between two solenoids,l+,said bolts passing through the said supports, the said solenoids, and the said projections E, while the upper bolt is also a support for the pulley G and gearwheel H. The armature is supported by a shaft, I, which carries a commutator, as shown, and which is retained by the supports A. The wheel H gears into the toothed wheel H upon the armature shaft. The armature has eight projections, a, equidistant, and in the grooves between said projections the wire is wound in four sets of coils, b, in the manner shown, thereby forming strong poles at X and weal; poles at Y. More particularly, the coils are located upon the grooved armature-core as follows: Fig. 2 shows an end view of the core containing four coils, b. Each two coils form a set. The coils in each set are parallel, and the said two sets or pairs are at right angles to each other. Each pair presses upon opposite sides of two opposite projections, a, in such a manner that every alternate projection a has no coils touching it, The projections which are in contact with the coils, as at X, are more strongly magnetic, as stated above, than those as at Y, upon the principle that a magnetic needle is more strongly attracted when placed close to an electric circuit than when located at a distance therefrom.

The operation of our machine is in general the same as that of others, and the purposes of the various elements are substantially the same.

The advantages secured by the especial disposition of parts and details of construction are, principally, an excellent efficiency and cheapness of construction.

Having now stated the object of the said invention; having described its practical realization by reference to the accompanying drawings; having particularly ascertained the manner in which the same operates to accomplish the said object, and having intimated that it is applicable to other purposes than those mentioned, what we consider to be novel and original, and therefore claim as our invention, secured to us by the hereinbefore in part recited Letters Patent of the United States, is-

An armature for an electric motor, consisting of a cylindrical core provided with eight longitudinal grooves upon its cylindrical surface, two sets of coils in said grooves, the coils OSBORN P. LOOMIS. HENRY W. GOOLEY.

Witnesses:

EBEN F. P. SMITH, WALTER F. FISHER. 

